Multilayer Capacitor Electrode Layout to Prevent Burr-Induced Shorts

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Solution Overview

Problem

Multilayer capacitors face issues with interlayer shorts due to burrs generated during the cutting process, leading to High Voltage Shock (HVS) defects and reduced Insulation Resistance (IR), which are not effectively addressed by existing manufacturing methods.

Innovation Solution

The design incorporates internal electrodes with protrusions and grooves on the edges, alternately disposed to reduce step differences and prevent burrs, along with dummy patterns in grooves to enhance insulation and adhesion, thereby increasing the capacitor's capacity and reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If internal electrode area is reduced in width direction, then capacitor size is miniaturized, but capacity decreases

Engineering Contradiction:

Improvecapacitor sizeVSAvoidcapacitor capacity

Core Design Contradiction:

Volume of moving objectVSQuantity of substance

Solution Approach 1:

The patent applies dimensionality change by extending internal electrodes in the width direction through protrusions that go beyond the laminate edges. This allows the effective electrode area to be larger than the laminate footprint would suggest. The protrusions utilize the third dimension (width direction extension) to increase capacity while keeping the main capacitor body compact, effectively decoupling capacitor size from electrode area.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If cutting precision is improved to reduce burrs, then interlayer shorts are reduced, but manufacturing complexity and cost increase

Engineering Contradiction:

Improveinterlayer short preventionVSAvoidmanufacturing process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by modifying the internal electrode geometry to include protrusions with specific dimensions extending beyond the laminate edges. This structural parameter change transforms the cutting process from requiring high precision (to prevent burr-induced shorts) to a more tolerant process where the protrusions compensate for burrs. The protrusion size and shape are optimized to provide adequate coverage while maintaining manufacturability.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11776743B2Multilayer capacitor and board having the same mounted thereon

Publication Date: 2023.10.03 SAMSUNG ELECTRO MECHANICS CO LTD

AI summary

A multilayer capacitor includes a capacitor body including a dielectric layer and first and second internal electrodes and having first and second surfaces opposing each other, third and fourth surfaces connected to the first and second surfaces and opposing each other, and fifth and sixth surfaces connected to the first and second surfaces, connected to the third and fourth surfaces, and opposing each other, first and second side portions disposed on the fifth and sixth surfaces of the capacitor body, respectively, and first and second external electrodes disposed on the third and fourth surfaces of the capacitor body, respectively, and connected to the first and second internal electrodes, respectively. The first and second internal electrodes have protrusions at one-side edge in a direction perpendicular to the fifth and sixth surfaces of the capacitor body.